Installation - Controllers
76
UNT-SVX07E-EN
BACnet networks with a Tracer SC system
controller
On BACnet networks with a Tracer SC system controller,
the Device ID for the UC400 controller is always soft set by
the system controller using the following scheme
illustrated below.
Note:
The BACnet Device ID is displayed as the Software
Device ID on the Tracer TU
Controller Settings
page in the
Protocol
group.
Figure 68
shows an example of BACnet link wiring with
multiple UC400 controllers.
Power Supply
Please read all of the warnings, cautions, and notices
below before proceeding with this section.
A separate transformer is recommended for each UC400
controller. The line input to the transformer must be
equipped with a circuit breaker sized to handle the
maximum transformer line current.
If a single transformer is shared by multiple UC400
controllers:
•
The transformer must have sufficient capacity.
•
Polarity must be maintained for every UC400
controller powered by the transformer.
Important:
If the polarity is inadvertently reversed
between two controllers powered by the
same transformer, a difference of 24Vac will
occur between the grounds of each
controller, which can result in:
•
Partial or full loss of communication on
the entire BACnet MS/TP link
•
Improper function of the UC400
controller outputs
•
Damage to the transformer or a blown
transformer fuse
Transformer Recommendations
A 24Vac power supply must be used for proper operation
of the binary inputs, which requires 24Vac detection. In
addition, the spare 24Vac outputs may be used to power
relays and TRIACS.
Figure 67.
BACnet device ID shown in controller
settings
Figure 68.
Example of BACnet link wiring with multiple
UC400 controllers
ADDRESS
0 1
2
3
4
56
7
8
9
x1
0 1
2
3
4
56
7
8
9
x10
0 1
2
3
4
56
7
8
9
x100
0
0
1
0
2
0
1
ADDRESS
0 1
2
3
4
56
7
8
9
x1
0 1
2
3
4
56
7
8
9
x10
0 1
2
3
4
56
7
8
9
x100
ADDRESS
0 1
2
3
4
56
7
8
9
x1
0 1
2
3
4
56
7
8
9
x10
0 1
2
3
4
56
7
8
9
x100
0
0
1
0
2
0
1
ADDRESS
0 1
2
3
4
56
7
8
9
x1
0 1
2
3
4
56
7
8
9
x10
0 1
2
3
4
56
7
8
9
x100
Link 1Link 2
BACnet device
ID for this
UC400
= 0012001
Last three digits determined
by rotary addesss dials on
the UC400 controller
First three digits determined
by rotary address dials on
Tracer SC system controller
Fourth digit determined
by link number to which the
UC400 controller is attached
UC400
BI
LINK
IMC
+
VDC
AI
AI
AI
AI
AI
P
P
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
BI
LINK
IMC
+
VDC
AI
AI
AI
AI
AI
P
P
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
BI
LINK
IMC
+
VDC
AI
AI
AI
AI
AI
P
P
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
+
+
BI
LINK
IMC
+
VDC
AI
AI
AI
AI
AI
P
P
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
+
BI
LINK
IMC
+
VDC
AI
AI
AI
AI
AI
P
P
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
+
Tracer SC
UC 400
UC 400
UC 400
Zone
Sensor
Zone
Sensor
Zone
Sensor
Trane BACnet
terminator
Zone sensor
communications
jack wiring
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
CAUTION
Personal Injury and Equipment Damage!
After installation, make sure to check that the 24 Vac
transformer is grounded through the controller. Failure
to check could result in personal injury and/or damage
to equipment. Measure the voltage between chassis
ground and any ground terminal on the UC400
controller. Expected result: Vac £ 4.0 V
NOTICE:
Avoid Equipment Damage!
Sharing 24 Vac power between controllers could cause
equipment damage.
